The experimentally determined Δs/kB at various B. The straight line fit is discussed in the text. The dotted line is the bare Zeeman energy assuming g0 = 0.44. The dashed line corresponds to the spin gap using the measured g* = 11.65 by the direct measurements. The inset corresponds to a schematic diagram (density of states N(E) versus E) showing the spin gap Δs as a result of the activated behavior from the localized states (hatched areas) to the extended states (in blue). The spin gap in the zero disorder limit Δs is the energy difference between the neighboring peaks in N(E).
Huang et al. Nanoscale Research Letters 2013 8:138 doi:10.1186/1556-276X-8-138